Reader Study: Five readers, radiologists that are experts in breast imaging and who are blinded to the study results, will be given de-identified MRI and DWI MRI images from the patient's entry MRI (MRIe) study and 1-year follow-up MRI (MRIf) study. Study radiologist data sheets will be completed for each study. The reader will have to complete the data sheets for MRIe before he/she can read and evaluate MRIf. The readers are blinded to the pathologic data at all times. For each condition MRIe and MRIf, each reader will check one of the checkboxes of each query that presents the lesion type (mass or non-mass enhancement), anatomic location (upper outer, upper inner, lower outer, lower inner or subareolar), largest dimension in centimeter, signal intensity on T1- and T2-weighted images (high, iso- or low to the fibroglandular tissue), morphology such as shape (round, oval, lobulated or irregular) and margin(smooth, irregular or spiculated) for mass, distribution (focal, linear, ductal, segmental or regional) for non-mass enhancement, enhancement pattern (homogeneous, heterogeneous, rim enhancement, dark internal septations, enhancing internal septations or central enhancement for mass; homogeneous, heterogeneous, stippled/punctate, clumped or reticular/dendritic for non-mass enhancement) and kinetic curve patterns on contrast-enhanced MRI (persistent, plateau or washout), signal intensity on DWI MRI /ADC map (high, iso-, low to the fibroglandular tissue) and an ADC value marked through quantitative analysis on the DWI study. The readers will assign any lesion(s) as benign, probably benign, suspicious and highly suggestive of malignancy according to the imaging findings and decide the probability of malignancy in percentages on contrast-enhanced MRI and DWI MRI, independently for the entry and final MRI study. After each radiologist reader has completed the data sheets for each patient, the data will be entered into a secure data base for statistical analysis.